LEPTINARIA. 319 
aperture, two slightly thickened and more darkly coloured interruptions of growth 
(varices), proving that it is a full-grown individual. 
9. Leptinaria sinistra, sp.n. (Tab. XVIII. fig. 11.) 
Testa conoidea, aperte perforata, verticaliter striatula, pallide griseo-flavidula, diaphana, tenera; anfr. 6, 
convexiusculi, ultimus rotundatus, basi convexus, levis; apertura verticalis, rhombea, margine externo 
convexiusculo, margine basali extrorsum ascendente, margine columellari parum obliquo, supra leviter 
dilatato et reflexo, medio obsolete denticulato. , 
Long. 4, diam. 2; apert. long. 13, lat. 3 millim. 
Last whorl, seen from the dorsal side, to the whole length of the shell as 1: 24. 
Hab. Cuntrau Nicaragua: Acoyapa, on the north side of the lake of Nicaragua (Beit, 
Dec. 1879). 
Distinct from all others of the genus by the sinistral whorls ; only one specimen 
was found. The quadrangular form of the aperture and the very feeble development 
of the columellar tooth are perhaps due to the shell not being full-grown. 
10. Leptinaria guatemalensis. 
Spiraxis guatemalensis, Crosse & Fisch. Journ. de Conch. xxv. p. 271 (1877)'; Fisch. & Crosse, 
Miss. Scient. Mex., Mollusca, i. p. 618, t. 25. figg. 10, 10a, 5”. 
Hab. N. Guatemata: Coban (Sarg ' 2). 
W. Gvuatemata: Retalhuleu, in a wood, under decayed leaves (Stol/: one young 
specimen). 
Var. majuscula, n. (Tab. XVIII. fig. 13.) 
Larger and with a stronger columellar fold. 
Long. 7-73, diam. 3-34 ; apert. long. 23-32, diam. 2 millim. 
Hab. N.W. Costa Rica: Guanacaste (Pitter). 
Centra Costa Rica: San José (Pittier). 
S.W. Costa Rica: Valley of the Rio Grande de Terraba, 30 metres above the sea, at 
the roots of large trees in the wood of Palmar (Pitiver, March 1892); Golfo 
Dulce (Pittier : young specimen). 
11. Leptinaria filicostata. 
Lamellazis filicostatus, Strebel, Beitr. Mex. Land- und Siissw.-Conch. v. p.113, t. 17. fig. 10 (1882)*. 
Hab. ©. Guatemata: San Miguel Jucume * (Starck *). 
Honpvuras: Copan, near the frontier of Guatemala (ex H. v. Lhering). 
12. Leptinaria biolleyi, sp.n. (Tab. XVIII. fig. 14.) 
Testa oblongo-conoidea, rimata, tenuis, leviter costulata, flavescens vel albida, diaphana ; anfr. 6, convexiusculi, 
sutura modice impressa, ultimus subtus modice rotundatus. Apertura subverticalis, oblique piriformis, 
* Probably San Miguel Turucu in the Polochic Valley. 
